DOWN HOLE DRILLS USING SPENT DRIVING FLUID FOR FLUSHING PURPOSES,申请号CA19902007610-传众专利搜索

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发明名称	DOWN HOLE DRILLS USING SPENT DRIVING FLUID FOR FLUSHING PURPOSES
摘要
申请公布号	CA2007610(A1)	申请公布日期	1991.07.11
申请号	CA19902007610	申请日期	1990.01.11
申请人	GUSTAFSSON, PER	发明人	GUSTAFSSON, PER
分类号	E21B21/00;(IPC1-7):E21B21/00	主分类号	E21B21/00
代理机构		代理人
主权项
地址

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